By Andrew Gould Yet another college basketball controversy has unfolded on the handshake line. On Saturday, North Carolina upset arch-rival Duke in Mike Krzyzewski’s final game at Cameron Indoor Stadium. Before everyone could send off the long-tenured head coach, Duke assistant Chris Carrawell declined to shake the hand of Tar Heels head coach Hubert Davis. The reported reasons have only ignited this story. Writer Jim Weber posted a screenshot from Zac Al-Khateeb of The Sporting News. Al-Khateeb cited Carrawell telling The Charlotte Observer’s C.L. Brown that Davis “did not shake our hands bef…